SKl'IOTKl Tills. 158 



lar character: they are probably identical, and may prove to be 



synonymous with S. Lessoniana. 



Red Sea. 



* """ Buccal meiiibrane without cups. 

 t Shell very thin, margin of wings not thickened. 



S. SEPioiDEA, Blainv. PI. 63, fig. 216. 



Body ovate, oblong, violet-spotted, acuminate behind ; fins 

 commencing some distance behind, outline subrhomboidal ; 

 sessile arms subulate, slender, order of length .3, 1, 4, 2, the 

 <lorsal ]iair compressed, the others depressed, the rings broad, 

 with long, acute teeth ; tentacles slightl}' clubbed, the cups in 

 four lines, of which those of the two central are largest. Shell 

 very thin, transparent, very broad, lanceolate; central ridge 

 broad above, narrow below. A small species, attaining 4 inches. 



West Indies. 

 t t Shell with margin of icings thickened. 

 S. Sloanii, Leach. 



Fins widest in middle of body. Shell with broad wings. 

 Not figured. 



West Indies. 

 S. ovATA, Gabb. PL 63, fig. 217. 



Body broad, bluntly pointed posteriorly ; fins narrow, regu- 

 larly rounded in marginal outline, widest in the middle; sessile 

 arms, order of length 3, 4, 2, 1, laterally' compressed, but 

 slightly dilated at the club. Shell with broad wings. 



West Indies. 



Mr. Gabb distinguishes it from S. Sloanii by the margin of 

 the shell not being thickened, but I find that the margin of his 

 t3'pical shell is thickened, and therefore it is ver^^ probable that 

 it is the same species. 



S. Blainvilliana. Per. and Orb. PI. 63, fig. 218; i)l. 64, figs. 



219, 220. 



Body cylindrical, attenuated but rounded behind ; fins fleshy, 



very broad, broadest in the middle, margin outline well rounded ; 



sessile arms long and slender, the rings oblique, with long, close, 



acute teeth ; tentacles with moderate clubs and suckers, the 



teeth of the rings similar to those of the sessile arms. Shell 



20 



